When comparing Bitbucket Pages vs GitHub Pages, the Slant community recommends GitHub Pages for most people. In the question“What are the best website hosting providers?” GitHub Pages is ranked 1st while Bitbucket Pages is ranked 9th. The most important reason people chose GitHub Pages is:
One of GitHub's features is a very powerful web editor which helps users edit or even create files right from the web browser, once the file is saved it's the same as a commit. Coupled with pages, this tool becomes even more powerful, giving users a free CMS that is easy to use and create.
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Pros
Pro Free private repositories
BitBucket allows users to have free private repositories as long as it's a team smaller than 5 that is working on a project. In other words, BitBucket charges per team member and not per repository member. This feature may make BitBucket, even BitBucket pages better than for example GitHub for some, since the static page's source code won't be open source, but it can still be viewed on the browser, so for static page hosting per se it is not a big deal.
Pro Multiple authentication methods
BitBucket supports GitHub, Twitter, Facebook, OpenID, Google and even GitHub authentication.
Pro The ability to create and edit files on the web UI gives GitHub pages the same power as a small CMS
One of GitHub's features is a very powerful web editor which helps users edit or even create files right from the web browser, once the file is saved it's the same as a commit. Coupled with pages, this tool becomes even more powerful, giving users a free CMS that is easy to use and create.
Pro Supports Jekyll
A simple, blog-aware static site generator, Jekyll makes it easy to create site-wide headers and footers without having to copy them across every page. It also offers some other advanced templating features.
Pro Supports custom domains
A custom domain can be added by creating a CNAME file with the necessary domain in the root of the repository and adding/changing corresponding DNS entries.
Pro Free tier
Static websites can be hosted on GitHub Pages for free as long as the repository is public. Private repositories start at $7/mo.
Pro Allows for all the git features when building your site, too
Cons
Con Unable to set cache expiry, must accept GitHub defaults (which are short)
Low cache expires - GitHub sets the cache-control: max-age header to 600 seconds, or ten minutes. Normally, you would set this value to a year so that it stays cached, and then use fingerprinting on your assets. Instead of serving style.css, you would serve something like style-62c887ea7cf54e743ecf3ce6c62a4ed6.css. As it stands now, assets are rarely going to be cached on repeat visits.
This will give a low score on https://developers.google.com/speed/pagespeed/insights with a 'should fix' recommendation around 'Leverage browser caching'.
For a high traffic site this may have implications